Added CoffeScript support

Usage is much simple:

 - Add src/main/webapp/WEB-INF/assets/coffee/something.coffee
 - Access http://localhost:8080/assets/js/something.js
Added Less support

Usage is much simple:

 - Add src/main/webapp/WEB-INF/assets/less/sample.less
 - Acceess http://localhost:8080/assets/css/sample.css
0.9.6-SNAPSHOT